S-51
3D Model

In autumn of 1943, GAU began the re-designing creation of self-propelled artillery systems, with large and extra-large capacity of destruction. Like ten years earlier, it was supposed to arm a platform with the 203 mm howitzer model 1931, with production planned to resume at the factory “Bolshevik” in 1944. If it succeeded, WPRA would get a mobile devastating weapon. By order of the People’s Commissar of Weapons Ustinov in November 1943, a competition to develop self-propelled guns was announced, which received the semi-official title of “Knight”.